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Palyno stratigraphy and petrology of lower gondwana coals in pench kanhan coalfield satpura godwana basin madhya pradesh india


Palyno stratigraphy and petrology of lower gondwana coals in pench kanhan coalfield satpura godwana basin madhya pradesh india



Geophytology 4(1): 7-24



An account of the palynostratigraphy, including correlation of coal seams in the Lower Gondwana sediments of Pench-Kanhan Coalfield, and an evaluation of coal types based on biopetrological studies of the coals collected from the various coal mines of the coalfield is presented. Some useful field observations and petrological details of the important rock types are also presented. Six biozones (cenozones) were recognized by detailed statistical palynological study of the characteristic miospore assemblages recovered from the Talchir rocks and overlying coal beds of the area. The lower 2 biozones (A and B) characterized by the dominance of radial monosaccate miospores but with or without Callumispora, are placed in the Talchir Stage. This placement is also corroborated by the associated Talchir lithology. The next 2 younger biozones (C and D), characterized by the dominance of Microbaculispor and Microfoveolatispora, in various percentages recovered from the coal and associated shales, are placed in the Karharbari Stage. The upper most biozones (E and F) characterized by the dominance of Brevitriltes and Sulcatisporites are placed in the Lower Barakar Stage. Palynologically, 4 coal seams are distinguishable. The correlation of coal seams and their lateral extension from Rawanwara Khas Colliery in the east and Rakhikol Colliery in the west were established palynologically. The ultimate coal composition derived from various organic and inorganic material was described in detail. Statistical maceral and microlithotype analysis of the coals revealed 4 distinct coal types corresponding to the 4 younger palynological zones. The age, nature and formation of the coals, and the climatic conditions prevailing during the time of deposition of the Lower Gondwana sediments in the area were also discussed.

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